Tachytelegraphic machine



5mm@ 18, E, BEUN 1,718,024

' TAGHYTELEGRAPHIC MACHINE Filed Deo. 11, 1925 Hg. l

Patented olune 18, 1929.

sauren STATES y l 11,718,024 PATENT OFFICE. f

EDOUARD BELIN',l 0F PARIS, FRANCE.

TACHYTELEGRAPHIC MAGHIN E.

Application led December 11, 1925, Serial No. 74,878, and in France December 17, 1924.

4 ducing signals of the same length by sending into the line `an electric current of a polarity determined by inserting in the line.

a positive or negative battery and of a voltage determined by inserting in the line at the transmitting end a Isuitable number ofI resistance as well as a certain number of battery elements.

According to this invention which is V based upon this t pe of machine resistances are' no longer use at the start; it is in effect materially impossible for a line however good, to retain the same resistance during the time required to send the number of-signals required for example for a complete.

telegram; the addition therefore of vresistances of fixed value cannot give any certainty of obtaining the constant variations at the end of the line necessary to give differing signals; this addition in order to remain comparable to itself may further be nodied according to the variations of the The practice however of placing the positive or negative pole of the battery in line is retained but currents are sent whose voltage is graduated by inserting a certain num ber of battery elements and these elements are all identical with the result that at the end of the line the variation received will be proportional to the number of additions provided, whatever may be the value of the resistance of the line. n

` When the transmitting machine employed is that described in the patent aforesaid 1. e. formed of conductive cylinders mounted upon the same axis and insulated from each other, and emplo ing :for transmission a perforated tape w ich passes between these cylinders and conductive brushes in such a.

manner as to close the circuit between them according to the position of the perforatio'ns four perforations are employed for the transmitting of a signal.'l Further the current is furnished by two batteries one of which is very large and allows the production of a current voltage in multiples of tens and the other smaller forms the addition and delivers 2, 4, 6 or 8 volts. It is therefore possible toy send over the line a current of an intensity graduated by fractions of two volts.

If, to give numerical data, the main battery commences at 40 volts and has 120 for its maximum, voltages of 20-32-44- 118-120-122-124126-,128 volts can. be sent, i.b e. by 45 fractions; and if the polarity -is inverted there is a possibility of sending 90 si als of different strengths.

l Ihese numbers are 'only given by way of illustration. In principle Athe number and the value of each addition will be determined by a number of signals that the transmitter should be able to send and the resistance in the line to be overcome. For' 5() signals for example a battery which can furnish five tens and a battery giving the four additions may suiice. The value of the voltages may moreover be fixed in a quite arbitrary manner by the determination of the fractions of one and the other battery; the method should also allow of sending over the line currents of selected voltages for giving inally comparable variations between 'two slgnals whatever may be the resistance value of the line. 4

The invention is illustrated in theaccompanying drawing in which the same figures and letters of reference have been adopted as in my co-pending application Serial No. 672,206 iled'danuary 11, 1923.

Figure 1 is a plan view of the transmitting apparatus of this invention,

Fig. 2 is .a diagram of ,the tape feed mechanism,

Fig. 3 is a schematic diagram showing the general arrangement of alphabet supports and line justification mirrors to be stepped into operative position. f

There will be seen four transmitting cylinders 16 for polarity two on the right and two on the left, one large and one smaller cylinder 15 for voltage.

' Brushes 16,, 16,, 163, 16,, connect the first polarity disk 161 to the zero of the large battery B the second disk 162 to the third 163 and the fourth 164 to the first 16,.

Brushes 15, connect the voltage disk 151 to stages of the batterf .B I(here 9 brushes pass to the sta es 40, 5 .120).

Brushesl 'connect the smaller tension disk 152 to the stages of the additional battery A (here 5 brushes pass to the stages 02.4.6189. l

Brushes 16 allow the polarity disks to be connected with the line; 16', and 16', to the wire L, and 162 and 164 to the other wire 2A brush l51 connects the large voltage disk 151 with the origin of battery A and a brush 152 connects the small voltage disk 152 with the bridge formed between the po; larity disks 162 and 163 by the interconnected brushes 1.62 and 16"3.

To take a concrete example, the tape will be supposed to be perforated as shown; it will be seen that current will take the path B0 16, 161 161 L, and L, 162 ier- 16mgi5',--iszma-nrial-iaf- A. current of 10d units will therefore be 3snt over the line L2 with return by way of If the polarity holes ,had been on the right the path would be at lBO--16,-164-164 152-A-A015'1151-B100 i. e. a current starting over L, with 104 units and returning to zero by L2 which is exactly 'the reverse of. the preceding.

This example serves to show the possible combinations with the tens and voltage units on the one hand and with polarities on the other hand.

It is evident that the value of the resistance of the line will react uponthe degree of the deviation of the receiving galvanometer per unit of voltage. But according to the momentary state of the oscillograph arrangement, the edect of the same voltage unit will not be the same for diderent polarities.

ln order to compensate for this diderence it is only necessary to introduce into the circuit two additions (resistances or voltages), in the present instance resistances R1 and R2 one in the line la, the other in the bridge between B0 and 164. Before transmitting the person transmitting will send a series of impulses of the same value but oi opposite sense and the person receiving will see the galvanometer deviate more in one direction than the other. @n the indication given the compensation resistances will be adjusted to eli'ect equality and this equality will be maintained so long as the value of the line remains as such'. Given ra idity f one regulation will practically be su cient for one transmission, but it may be adjusted periodically or on request when desired.

To ensure the proper functioning of the perforated tape in spite of the rapidity of unwinding and thechange of the diameter of the spools the additional improvement following may be employed.

A light counterweight retains an unwinding spool whileia substantially heavier weight urgls the winding on s ool. The motor whic effects the rotation o the transmitting cylinder forms in reality a brake on' the speed which results from the differences ariaeaa motor may, for example, be of any tpe of synchronous motor such as the uillet motor etc.

This arrangement is illustrated in the diagram shown in Figure 2 comprising a wind- .ing oli' spool D from which the perforated tape S passes beneath the brushes and over the cylinder T (a friction wheel or a marginal tooth ensuring the action of such cylinder upon the tape) and a winding on drum R; the weights p and P ensure the diierential drive described'.

If the special application of this ultrarapid transmission be applied in a telety e machine the letters transmitted should didlr from those received a signal should be reserved for effecting a change of alphabet. This signal may for example be the maximum voltage in a predetermined sense; The corresponding perforations will be longer in order that the relays or other operating means may have time to function.4

When this transmitting machine is applied to an optical receiving system as disc osed in my copending application above referred y to, wherein a spiral mirror, device is interposed in the luminous beam, there may be several such mirror devices correondiiig to u" ine different alphabets requirin di erent justification and so arrange that a signal impulse sent to edect archange of alphabet will act simultaneously u on the alphabet support and the support ihr the mirror devices t'o bring an alphabet and its corresponding mirror device into operative position. To eli'ect this operation the supports may be arranged on a circular or rotating carriage as diagrammatically indicated in Fig. 3.

ies' y The receiver at the Yreceiving station used in conjunction with the transmission station :includes an oscillograph A which receives a beam of light from the source lB which beam passes t rough a condenser C,.a diaphragm D and a lens E. This oscillograpfli is deflected by the transmitter according to the strength and voltage of the current impulses transmitted over the line. The beam of light is reflected by the mirror of the oscillograph onto a scale of letters indicated iis at F and the rays of light pass through this scale, through the condenser G, the lens H and onto the res ective mirrorsill `of anarcuately'rra'nge system from which mirrors the rays are reflected to a common 'focal point. At this focal point is arranged a rotative reflector device J which is in the form of a spiral staircase and this reeetor device in turn tlirovvs tlie rays upon tbe sensitized surface lil on tlie cylinder L in .such manner that the letters are imposed a spiral form. in this event it is necessaryl only to send a proper signal which Will cause a shitting of the support carrying the different alphabets and the support carrying the different mirror devices in order to bring about a correspondence betweentlie matter transmitted and that received at the receiving station.. This feature is not herein claimedu` Having now particularly described and ascertained the nature of my said invention and in what manner the saine is to be per! tormed, l declare that what l claim is:

l. lin apparatus for transmitting signals over a line? the combination of? a battery of unit sources or current vvitli means for in= serting in the line selected source units comprisi'ng a plurality of conductive cylinders,

certain of vvliicli cylinders determining tbe polarity oil tlie current o?? any of tbe units and certain other of said cylinders determining tlie units, said units being arranged to produce a series of several voltages increasin in aritbmetical progression, a set of brus es contacting with the cylinders, a second setoii brushes, and a perforated ta 'e interposed between the cylinders and t e last mentioned brushes and permitting the contact of said brushes with the cylinders only through the periorations thereof.

2. In apparatus for transmitting signal potential impulses over a line circuit7 the combination of a battery of unit sources of current, means tor connecting one or more units to tlie line in one polari-ty through a given circuit conductor and in the opposite polarity exclusive of said given circuit conn ductor, electrical adjusting; means in the line circuit, and electrical adjusting means in the said given circuit conductor.

In testimony whereof l aiiix my Signatura dit till 

